Roller bit



Mae files? r July 25, 1933. R. 'GIESEY ROLLER BIT Filed Dec. 12, 1931 Patented gul y 25, 1933 UNITED, STATES PATENT: "OFFICE COMPANY, OF HOUSTON, TEXAS, A CORPORATION OIli TEXAS norm 311:

Application filed December 12, 1931. Serial No. 580,609.

This invention relates generally to deep well drilling apparatus and specifically to roller bits.

It has for its object the provision of anew and imprdved roller bit adapted to drill soft and hard formations.

The preferred embodiment of the invention is illustrated by the accompanying drawing, of which Fig. 1 is a fragmentary sectional elevation of the bit; Fig. 2, a side elevation of the cutter pin; Fig. 3, a fragmentary side elevation of the head taken at a right angle to Fig. 1; and Fig. 4, a bottom plan- View.

In the drawing, the bit head is shown fragmentarily at 1. It is connected to the conventional drill stem .by means not shown. The numeral 2 indicates water courses through which water is directed to the roller cuttersto remove particles of formation adhering thereto.

A pair of bearing extensions 3 and 4 depend from opposite sides of the head and have in their lower ends downwardly opening slots 5 and 6. The inner walls 7 and 8 of thesebearing extensions are inclined upwardly and inwardlyat different angles to the longitudinal axis of the head.

The cutter pin is indicated at 9. It has a first cutter bearing ortion 10 and a second cutter bearing portion 11 and reduced extremities 12 and 13. Adjacent the inner ends of the bearing extensions 10 and 11 are annular flanges 14 and 15. When the pin9 is in place in the head the first cutter bearing portion 10 extends downwardly and inwardly from and at substantially a right angle to the inner wall 7 of the bearing extension 3; and the second cutter bearing portion 11 extends inwardly and downwardly from and at sub stantially a rightangle to the inner wall 8 of the bearing extension 4. The reduced extremities 12 and 13 are slidable upwardly in the slots 5 and 6.

Upon the first cutter bearing portion 10 is a first cutter 16 that extends laterally beyond the periphery of the head. A washer 17 having a key 18 fitting in slot 5 may be interposed between the cutter 16 and the wall 7.

Upon the second cutter bearing portion 11 are second and third cutters 19 and 20. These cutters may be spaced by a washer 21; and a washer 22 maybe interposed between the I cutter 20 and tne wall 8, a key 23 to fit inslot 6.

The cutters may be provided with roller bearings 24;. I

It will be observed that the second cutter 19 extends below the first cutter 16 and, therefore, cuts in advance thereof. The first cutter 16 will be balanced by the second cutters 19 and 20., The cutters are large, but an open space between the head and the cutters is provided so that the cutters may be kept clean by the water from the courses 2.

The cutter assembly may be slipped-upand provided with wardly into the head as a unit, the reduced extremities 12. and 13 of the pin 9 entering the slots 5 and 6. The extremities of the pin may then be welded to the head to removably hold the assembly in plaee.

I claim:

1. In a roller bit: a head having a pair of bearing extensions depending from opposite sides thereof, each' of said extensions having a downwardly opening slot, the inner walls of said extensions being inclined ,up-

wardly and inwardly at different angles to the longitudinal axis of said head; a pin having a first cutter bearing portion to extend downwardly and inwardly from and at substantially a right angle to one of said walls, and a second cutter bearing portion to'extend downwardly and inwardly from and at substantially a right angle to the other of said walls; thefirst of said bearing portions being shorter than the secondlof said bearing portions; annular flanges adjacent the inner endsof said bearing portionsaa first roller cutter on the first of said bearing portions to extend laterally} beyond the periphery of said head; and a pair of roller cutters on the econd of: said bearing portions to balan'ce said first cutter; the innermost of said pair of cutters extending below said first cutter tocut in advance thereof; said pin with said cutters thereon being secured to and slidable into the slots in said extensions, the

ends of said of said slots.

pin being supported by the walls L 2. In a roller bit: a head having a pair of bearing extensions depending from opposite sides thereof, the inner walls of said extensions being inclined upwardly and inwardly 5 at difierent angles to the longitudinal axis of said head; a pin mounted in said extensions and having a first cutter bearing portion extending downwardly and inwardly from and at substantially a right angle to one of said walls, and a second cutter bearing portion extending downwardly and inwardly from and at substantially a right angle to the other of said walls; the first of said bearing portions being shorter than the second of said bearing portions; a first roller cutter on the first of said bearing portions and extending laterally beyond the periphery of said head; and a pair ofroller cutters on the second of said bearing portions to balance said first cutter; the innermost of said pair of cutters-extending below said first cutter to cut in advance thereof.

3. In a roller bit: a head having a pair of bearing extensions depending from opposite sides thereof, the inner walls of said extensions being inclined upwardly and inwardly at difi'erent angles to the longitudinal axis of said head; a pin mounted in said extensions and having a first cutter bearing portion extending downwardly and inwardly from and at substantially a right angle to one of said walls, and a second cutter bearing portion extending downwardly and inwardly from and at substantially a right 35 angle to the other of said walls; a first roller cutter on the first of said bearing portions and extending laterally beyond the periphery of said head; and a second roller cutter on the second of said bearing portions, said second cutter extending below said first cutter to cut in advance thereof.

, 4. In a roller bit: a head having a pair of bearing extensions depending from opposite sides thereof, each of said extensions having adownwardly. opening slot, the inner wall of said extensions being inclined upwardly and inwardly at different angles to the longitudinal axis of said head; a pin having a first cutter bearing portion to extend downwardly and inwardly from and at substantially a right angle to one of said walls, and a second cutter bearing portion to extend downwardly and inwardly from and at substantially a right angle to the other of said walls; the first of said bearing portions being shorter than the secondof said bear-v arranged to travel in cutting paths substantially equal to the transverse area of the head, said pin with said cutters thereon being secured to and slidable into the slots in said extensions, the ends of said pin being supported by the walls of said slots.

5. In a roller bit: a head having a pair of bearin extensions depending from opposite sides t ereof, the inner walls of said extensions being inclined upwardly and inwardly at different angles to the longitudinal axis of said head; a pin mounted in said extensions and having a first cutter bearing portion extending downwardly andinwardly from and at substantially a right angle to one of said walls, and a second cutter bearing portion extending downwardly and inwardly'from and at substantially a right angle to the other of said walls; the first of said bearing pertions being shorter than the second of said bearing portions; a first roller cutter on the first of said bearing portions and extending laterally beyond the periphery of said head;

and a pair of roller cutters on the second of said bearing portions to: balance said first cutter; said three cutters being arranged to travel in cutting paths substantially equal to the transverse area of said head. 4

6. In a roller bit a head having a pair of bearingextensions depending from opposite sides thereof, the inner walls of said extensions being inclined upwardly and inwardly at different angles to the longitudinal axis of said head; a pin mounted in said extensions and having a first cutter bearing portion extending downwardly and inwardly from and at substantially a right angle to-one of said i walls, and a second cutter bearing portion extending downwardly and inwardly from and at substantially a right angle to the other of said walls, a first roller cutter on the first of said bearing portions and extending laterally beyond the periphery of said head; and a second roller cutter on the second of said bearing portions.

In testimony whereof, I hereunto aflix my signature.

RUSSELL GIESEY. 

